P
US8632896B2ActiveUtilityPatentIndex 47

Radiation-curable vinyl chloride copolymer, radiation-curable composition, and magnetic recording medium

Assignee: ARAKI KATSUMIPriority: Nov 12, 2009Filed: Nov 11, 2010Granted: Jan 21, 2014
Est. expiryNov 12, 2029(~3.4 yrs left)· nominal 20-yr term from priority
Inventors:ARAKI KATSUMI
C08F 216/1416C08F 220/26C08G 18/8116C08G 18/6212G11B 5/7021C08G 18/4676G11B 5/7028C08G 18/675G11B 5/7026C08G 18/664C08F 8/30C08G 18/6287C08F 214/06C08K 5/08
47
PatentIndex Score
1
Cited by
10
References
20
Claims

Abstract

An aspect of the present invention relates to a radiation-curable vinyl chloride copolymer, which comprises a structural unit denoted by general formula (1): wherein, in general formula (1), R 1 denotes a hydrogen atom or a methyl group, and L 1 denotes a divalent linking group denoted by formula (2), formula (3), or general formula (4): wherein, in general formula (4), R 41 denotes a hydrogen atom or a methyl group.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A radiation-curable vinyl chloride copolymer, which comprises a structural unit denoted by formula (1): 
       
         
           
           
               
               
           
         
         wherein, in formula (1), R 1  denotes a hydrogen atom or a methyl group, and L 1  denotes a divalent linking group denoted by formula (2), formula (3), or formula (4): 
       
       
         
           
           
               
               
           
         
         wherein, in formula (4), R 41  denotes a hydrogen atom or a methyl group. 
       
     
     
       2. The radiation-curable vinyl chloride copolymer according to  claim 1 , which further comprises a structural unit denoted by formula (5): 
       
         
           
           
               
               
           
         
         wherein, in formula (5), each of R 51  and R 52  independently denotes a hydrogen atom or a methyl group, L 51  denotes the divalent linking group denoted by formula (2), formula (3), or formula (4), and L 52  denotes a divalent linking group. 
       
     
     
       3. The radiation-curable vinyl chloride copolymer according to  claim 1 , which further comprises a cyclic ether structure. 
     
     
       4. The radiation-curable vinyl chloride copolymer according to  claim 1 , which comprises a polar group selected from the group consisting of a sulfonic acid group, a sulfonate group, a sulfuric acid group, and a sulfate group. 
     
     
       5. The radiation-curable vinyl chloride copolymer according to  claim 4 , which comprises a structural unit denoted by formula (6): 
       
         
           
           
               
               
           
         
         wherein, in formula (6), R 6  denotes a hydrogen atom or a methyl group, L 6  denotes the divalent linking group denoted by formula (2), formula (3), or formula (4), and M denotes a hydrogen atom or a cation. 
       
     
     
       6. A radiation-curable composition, which comprises the radiation-curable vinyl chloride copolymer according to  claim 1 . 
     
     
       7. The radiation-curable composition according to  claim 6 , which further comprises a benzoquinone compound. 
     
     
       8. The radiation-curable composition according to  claim 6 , which further comprises a radiation-curable polyurethane resin. 
     
     
       9. The radiation-curable composition according to  claim 6 , wherein the radiation-curable vinyl chloride copolymer further comprises a structural unit denoted by formula (5): 
       
         
           
           
               
               
           
         
         wherein, in formula (5), each of R 51  and R 52  independently denotes a hydrogen atom or a methyl group, L 51  denotes the divalent linking group denoted by formula (2), formula (3), or formula (4), and L 52  denotes a divalent linking group. 
       
     
     
       10. The radiation-curable composition according to  claim 6 , wherein the radiation-curable vinyl chloride copolymer further comprises a cyclic ether structure. 
     
     
       11. The radiation-curable composition according to  claim 6 , wherein the radiation-curable vinyl chloride copolymer further comprises a structural unit denoted by formula (6): 
       
         
           
           
               
               
           
         
         wherein, in formula (6), R 6  denotes a hydrogen atom or a methyl group, L 6  denotes the divalent linking group denoted by formula (2), formula (3), or formula (4), and M denotes a hydrogen atom or a cation. 
       
     
     
       12. A magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, which comprises at least one radiation-cured layer obtained by radiation-curing a coating layer comprising a radiation-curable vinyl chloride copolymer, the radiation-curable vinyl chloride copolymer being the radiation-curable vinyl chloride copolymer according to  claim 1 . 
     
     
       13. The magnetic recording medium according to  claim 12 , wherein the radiation-cured layer is the magnetic layer. 
     
     
       14. The magnetic recording medium according to  claim 12 , which comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder between the nonmagnetic support and the magnetic layer, the nonmagnetic layer being the radiation-cured layer. 
     
     
       15. The magnetic recording medium according to  claim 12 , wherein the coating layer further comprises a benzoquinone compound. 
     
     
       16. The magnetic recording medium according to  claim 12 , wherein the coating layer further comprises a radiation-curable polyurethane resin. 
     
     
       17. The magnetic recording medium according to  claim 12 , wherein the radiation-curable vinyl chloride copolymer further comprises a structural unit denoted by formula (5): 
       
         
           
           
               
               
           
         
         wherein, in formula (5), each of R 51  and R 52  independently denotes a hydrogen atom or a methyl group, L 51  denotes the divalent linking group denoted by formula (2), formula (3), or formula (4), and L 52  denotes a divalent linking group. 
       
     
     
       18. The magnetic recording medium according to  claim 12 , wherein the radiation-curable vinyl chloride copolymer further comprises a cyclic ether structure. 
     
     
       19. The magnetic recording medium according to  claim 12 , wherein the radiation-curable vinyl chloride copolymer comprises a polar group selected from the group consisting of a sulfonic acid group, a sulfonate group, a sulfuric acid group, and a sulfate group. 
     
     
       20. The magnetic recording medium according to  claim 19 , wherein the radiation-curable vinyl chloride copolymer comprises a structural unit denoted by formula (6): 
       
         
           
           
               
               
           
         
         wherein, in formula (6), R 6  denotes a hydrogen atom or a methyl group, L 6  denotes the divalent linking group denoted by formula (2), formula (3), or formula (4), and M denotes a hydrogen atom or a cation.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.